“They are not sure how seriously to take some of his pronouncements but they’re rattled by him — and for good reason, because a lot of the proposals that he’s made display either ignorance of world affairs or a cavalier attitude,” Obama said.

When a reporter asked Trump about Obama’s comments at a press conference in North Dakota, Trump said “that’s good.”

“Is that right? That’s good,” Trump said.

He continued:

I love that word. He used a bad word because he knows nothing about business. When you rattle someone, that’s good. … Many of the countries in our world, our beautiful world, had been absolutely abusing us and taking advantage of us. So if they’re rattled, in a friendly way, we’re going to have great relationships with these countries, but if they’re rattled in a friendly way, that’s a good thing … not a bad thing.”

Trump went on to say that Obama is a “president who’s done a horrible job.”